Dear colleagues: Dr. Pritt strictly mentioned "10 to 20 micrometers in diameter" in the text. So, don't be misleaded about pollen grains which are much larger in size. Focus on the other smaller structures.

The pollen could indeed be from the Geraniaceae as Ozgur suggests. Geraniaceae pollen also have three lobes. Although I would stay with Oleaceae pollen. The lobes of Oleaceae are more rounded. A useful internet link for pollen: https://globalpollenproject.org/Taxon?rank=Family&page=2

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